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For serine, pKalpha-COOH = 2.21, and for leucine, pKalpha-COOH = 2.36. If a mixture of 10 millimoles each of serine and leucine at pH = 2.40 is passed through a cation-exchange column and eluted with additional buffer at pH = 2.40, which of the following will take place? A. Serine and leucine will elute together. B. Neither serine nor leucine are eluted from the column because the pH of the elution buffer is too low. C. Neither serine nor leucine are eluted from the column because the pH of the elution buffer is too high. D. Leucine will elute first, followed by serine. E. Serine will elute first, followed by leucine.
10 M solution of chloroacetic acid, ClCH2CO2H, has a pH of 1.95. calculate Ka for the acid.
which compound has lowest soulubility in water?
a 1.00 g sample of a large biomolecule was dissolved in 18.0 g of carbon tetrachloride. the boiling point of this
What is the boiling point of a solution of benzene containing 0.2 moles of a non volatile solute in 125 grams of benzene given that pure bezene has a boiling point of 80.1
calculate how many moles of the product form when 0.040mol of K completely reacts. Assume that there is more than enough of the other reactant. 4K(s)+O2(g)?2K2O(s)
A 0.1036 g sample containing only BaCl2 and NaCl is dissolved in 50 mL of distilled water. Titration with 0.07916 M AgNO3 requires 19.46 mL to reach the endpoint. What is the % by wt. of NaCl in the sample
What volume of 0.300 M CaCl2 is needed to prepare 240. mL of a solution which is 0.100 M in chloride ion.
Calculate the pH of the solution that results when 20 ml of 0.100 M CH3COOH is mixed with 10.00 mL 0.200 M NaOH
if the height of the mercury column in a leveling bulb is 30 mm greater than that in the gas buret and atmospheric pressure is 670 mm, what is the pressure on the gas trapped in the buret.
What is the value of Delta S when 2.7g of CH4 is compressed from 29.0 L to 18.0 L at a constant temperature of 100 C?
Why is toxicity diminished in other congeners where chlorines are removed from the 2,3,7,8 positions, or when chlorines are added to remaining positions on the rings?
A spherical fat cell has a diameter of 2.47 micrometers. The fat cell contains three copies of the protein azurin. What is the molar concentration of azurin within the fat cell
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